Arching and Convolution

verb

• Form an arch or curve.
  • usage: "her back arches"; "her hips curve nicely"
  • synonyms: arch, curve, arc

adjective

• Forming or resembling an arch.
  • usage: "an arched ceiling"
  • synonyms: arced, arched, arciform, arcuate, bowed

• (p.pr.&vb.n.) of Arch.
• (n.) Hogging; -- opposed to sagging.
• (n.) The arched part of a structure.

noun

• The shape of something rotating rapidly.
  • synonyms: whirl, swirl, vortex
• A convex fold or elevation in the surface of the brain.
  • synonyms: gyrus
• The action of coiling or twisting or winding together. .

• (n.) An irregular, tortuous folding of an organ or part; as, the convolutions of the intestines; the cerebral convolutions. See Brain.
• (n.) The state of being rolled upon itself or rolled or doubled together; a tortuous or sinuous winding or fold, as of something rolled or folded upon itself.
• (n.) The act of rolling anything upon itself or one thing upon another; a winding motion.